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VN750 General Discussion

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post #1 of 10 (permalink) Old 06-28-2018, 11:43 AM Thread Starter
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On my way to work my bike stalled out on me. I was sitting a a red light and when it turned green I started to accelerate and boom died, started right back up and as I accelerated to take off it tried to stall again. I gave it more throttle up to around 3,500-4,000 rpms and it took of ok. Spit and sputtered till I got back up to around 3,000 rpms then ran great. Every gear change that dropped the bike below 3,500 rpms cause the same spit and sputter till a higher rpm was reached. Do I need to pull and clean carbs? Spark plugs seemed ok when I checked them last night, not burnt and ashy or wet. Also when its spits and sputters the exhaust smells heavily of raw unburt fuel. Plug wires possibly?

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post #2 of 10 (permalink) Old 06-28-2018, 12:43 PM
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Anything at low RPM is pilot jet, Mid rpm is main jet.

If voltage is good, clean your jets.


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post #3 of 10 (permalink) Old 06-28-2018, 02:38 PM
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One of your carbs is flooding out due to a sticky float needle. Look up Wolfie's back blow method in the sticky section of the carburation board

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post #4 of 10 (permalink) Old 06-28-2018, 03:47 PM
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that too.
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1981 KZ750
1988 Vulcan VN750 (red)
2005 Vulcan VN750 (silver)
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post #5 of 10 (permalink) Old 06-29-2018, 10:25 AM Thread Starter
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Didn't do the blow back yet, but on my way home last night and on my way to work the bike ran great. What would cause that to intermittently happen? Nothing was done to the bike to make a differance. I'm so frustrated, sometimes it will act up and others it runs beautifully. Is that just the nature of the beast or something else?

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post #6 of 10 (permalink) Old 06-29-2018, 10:40 AM
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Quote:
Originally Posted by cepak4772 View Post
Didn't do the blow back yet, but on my way home last night and on my way to work the bike ran great. What would cause that to intermittently happen? Nothing was done to the bike to make a differance. I'm so frustrated, sometimes it will act up and others it runs beautifully. Is that just the nature of the beast or something else?

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Maybe small pieces of crud that stick the needle open,then it passes through,the needle closes, then another piece of crud...

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Support your local FREEBIRDS MC
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lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
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post #7 of 10 (permalink) Old 06-29-2018, 01:48 PM
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Maybe you could try running some Seafoam through it. A lot of guys including me get good results from it.
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post #8 of 10 (permalink) Old 06-29-2018, 02:57 PM Thread Starter
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Maybe you could try running some Seafoam through it. A lot of guys including me get good results from it.
I went to walmart to get some and they were sold out... so I grabbed the walmart brand hoping it would do in a pinch but not sure it's working


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post #9 of 10 (permalink) Old 06-30-2018, 03:19 AM
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Quote:
Originally Posted by OleDirtyDoc View Post
Maybe small pieces of crud that stick the needle open,then it passes through,the needle closes, then another piece of crud...

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Been through that a few times with several of my VN's. Early in the season mine did that and it usually clears up for me if I just reach under and drain the bowls. The suction of it draining usually fixes it. I have twin fuel filters so I still don't know how it gets in there, but the drain method has always saved me from having to pull the carbs.


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1988 Vulcan VN750 (red)
2005 Vulcan VN750 (silver)
(2) 1994 Vulcan VN750 (red)

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post #10 of 10 (permalink) Old 06-30-2018, 06:59 AM Thread Starter
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Been through that a few times with several of my VN's. Early in the season mine did that and it usually clears up for me if I just reach under and drain the bowls. The suction of it draining usually fixes it. I have twin fuel filters so I still don't know how it gets in there, but the drain method has always saved me from having to pull the carbs.
It acted up again on my way to work this morning, so I'll definitely give it a drain and blow back to to make sure. I'm not complete machine dumb just never wrenched on a bike and don't want to have to pull the carbs and screw something up and be out a bike till it gets fixed.

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